Printing paper and method of manufacturing the same

ABSTRACT

Disclosed is a printing paper comprising a back surface thereof applied with a repositionable adhesive, adhered to a coated surface of a PET sheet paper, which can be freely repositioned and printed at high resolution up to 2800 dpi even by ink-jet printers as well as laser printers. Thus, the printing paper is variously utilized for reports, color-printed paper and public information paper. In particular, the printing paper for use in public information paper. In particular, the printing paper for use in public information paper or guide paper can be attached to any surface in a typical office, and separated therefrom, and again attached to other surfaces. A method of manufacturing be printing paper is also provided.

TECHNICAL FIELD

The present invention relates to a novel printing paper and a method of manufacturing the same, characterized in that the printing paper can be repeatedly repositioned, and printability of high resolution is further ensured even by ink-jet printers.

BACKGROUND ART

In typical, A4 size (210×297 mm) printing paper is used in 90% or more in offices, and also adaptable for most printers. That is, A4 size printing paper is generalized.

However, when A4 paper having printed contents (advertisement, information, etc.) is attached to walls or notice boards, there are a variety of inconveniences, such as using transparent tape or tacks, or applying paste to the paper. Alternatively, label paper for postal mail, which is provided with an adhering surface to be adhered to a coating paper, is known. However, since such label paper is previously cut to predetermined sizes, specified word files based on word processors must be used. Thus, it is difficult to freely print desired contents on the label paper. As well, due to disposable attachments, after the label paper is attached to a predetermined surface, it is impossible to further attach the detached label paper to another surface.

In addition, the bleeding of ink on the printing paper becomes severe upon printing by use of ink-jet printers. Therefore, with the aim of ensuring printability of high resolution, laser printers have been mainly employed. As for the ink-jet printer, because a printing process is carried out by jetting ink through a nozzle, the resolution greatly depends on a period required for sticking ink to the printing paper and a printing paper material capable of absorbing ink. However, a printing process conducted on conventional printing paper by use of the ink-jet printers results in the resolution amounting to 800 dpi, at most.

DISCLOSURE OF THE INVENTION

Accordingly, the object of the present invention is to alleviate the problems encountered in the related art and to provide an A4 size printing paper used in a sticking manner for convenience of the users.

Another object of the present invention is to provide an A4 size printing paper that is freely attachable and detachable, by applying a repositionable adhesive onto an adhering surface of the printing paper.

Still another object of the present invention is to provide a printing paper, characterized in that a coating agent is applied to a front surface (a printing surface) of the printing paper for the enhancement in stickiness of ink, thus achieving ink-jet printing at high resolutions.

A further object of the present invention is to provide a method of manufacturing the printing paper having the above characteristics.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a view illustrating a printing paper of the present invention when being used.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a detailed description will be give of a printing paper and a manufacturing method thereof, in conjunction with the accompanying drawing.

Referring to FIG. 1, there is shown the printing paper of the present invention when being practically used.

As shown in FIG. 1, the printing paper of the present invention is characterized in that a back surface (b) of the printing paper is applied with a repositionable adhesive, and then adhered to a PVC vinyl-coated PET (PolyEthylene Terephthalate) sheet paper (PE laminating paper or coating paper), while a front surface (a) of the paper, that is, a printing surface on which printing contents are printed by printers, is applied with a coating agent for the increase in stickiness of the ink.

In the present invention, the adhesive, which is applied onto the back surface of the printing paper adhered to the PET sheet paper, comprises 43-47 parts by weight of vinyl acetate-acrylic acid ester copolymer resin, 1.5-2.5 parts by weight of a nonionic surfactant (poly ory ethylene nonyl phenyl ether), 16-20 parts by weight of an inorganic filler (calcium carbonate), 1,000-2,000 ppm of vinyl acetate monomer, 1,000-2,000 ppm of 2-EHA (Ethyl Hexyl Acrylate) monomer, and 32-36 parts by weight of water.

As for known “Post-it”, the repositionable adhesive for use on almost any adhering surface includes an acryl base dissolved in a volatile organic solvent, such as toluene. However, in the present invention, such an acryl base is dissolved in water, whereby the odors of volatile components are decreased and further the reduction in adhesion due to the evaporation of the volatile components is overcome. Also, environmental contamination is reduced.

Thus, the adhesive of the present invention can exhibit adhesion at a predetermined level. As well, when the printing paper is detached from the attaching surface, both the paper and the attaching surface are not damaged. In addition, no impurities exist on the attaching surface.

The adhesive of the present invention is preferably applied at a thickness of 25 μm on the surface of the printing paper.

Therefore, the printing paper of the present invention is advantageous in that the printing contents are made by use of a word processor and output in state of being printed on the printing paper, after which the printing paper is separated from the PET sheet paper, and then can be attached to desired surfaces and easily detached therefrom and again attached to other surfaces, as in conventional memo paper (Post-it®).

Further, in the present invention, a coating agent is used for the enhancement of the stickiness of ink jetted from the ink-jet printer, comprising 23-27 parts by weight of silica (SiO₂) powders, 46-50 parts by weight of a polymeric binder, 1 part by weight of a conventional ink sticking agent, 1 part by weight of a conventional ink fixing agent, and 20 parts by weight of water.

The coating agent is uniformly coated onto the front surface of the printing paper and dried at 120° C. for about 20 sec, thereby completing the preparation of a printing paper of the present invention.

As for the coating agent of the present invention, larger amounts of silica are used, whereby general physical properties of inorganic materials, including heat stability, chemical stability, glossiness and wear resistance, can be further exhibited, in addition to the properties of organic materials including reactivity, solubility, elasticity and adhesion, compared to conventional cases using only ink sticking agents. Further, such a coating agent reacts with moisture in air and is gradually hardened from the surface to the inside, whereby it functions to quickly fix ink jetted onto the printing paper by the ink-jet printer and to prevent the ink from spreading or bleeding. Even though water is stained on the ink-jet printed surface, the coating agent acts to prevent ink from bleeding.

Hence, the printing paper applied with the coating agent can instantaneously absorb and fix ink jetted by the ink-jet printer, thereby achieving high resolution up to 2,800 dpi.

In addition, a method of manufacturing the printing paper of the present invention comprises the steps of (A) preparing a coating agent consisting mainly of 23-27 parts by weight of silica, 46-50 parts by weight of a polymeric binder, 1 part by weight of an ink sticking agent, 1 part by weight of an ink fixing agent, and 20 parts by weight of water, and (B) applying 8.4 g of the coating agent onto a front surface of a printing paper, followed by drying the coating agent applied onto the front surface of the printing paper at 120° C. for about 20 sec. Also, the method comprises (C) preparing an adhesive having 43-47 parts by weight of vinyl acetate-acrylic acid ester copolymer resin, 1.5-2.5 parts by weight of a nonionic surfactant (poly ory ethylene nonyl phenyl ether), 16-20 parts by weight of an inorganic filler (calcium carbonate), 1,000-2,000 ppm of vinyl acetate monomer, 1,000-2,000 ppm of 2-EHA monomer, and 32-36 parts by weight of water, (D) applying 8.4 g of the adhesive onto a back surface of the printing paper, and (E) adhering the back surface of the printing paper applied with the adhesive to a PET sheet paper.

The above method further includes the step of (F) cutting the printing paper adhered to the PET sheet paper to a predetermined size (A4 or B5).

INDUSTRIAL APPLICABILITY

As described above, the present invention provides a printing paper and a method of manufacturing the same. The printing paper is advantageous in terms of high resolution up to 2800 dpi even by ink-jet printers as well as laser printers, and various applications for use in reports, color-printed paper and public information paper. In particular, the printing paper, useful as public information paper or guide paper, can be freely attached to notice boards, walls, partitions placed in the front of the desks, and conveniently detached therefrom, and again attached to other surfaces.

In addition, a repositionable adhesive of the present invention does not damage paper and the attaching surfaces when the paper is separated from the attaching surfaces. Also, no impurities are present on the attaching surfaces, thus maximizing convenience for users.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 

1. (cancel)
 2. An improved printing paper of the type in which an adhesive that is repositionable is deposited on a back surface of a printing paper and a PET sheet paper is positioned on the adhesive over the back surface of a printing paper, wherein the improvement comprises: a coating agent deposited on a front surface of a printing paper to increase stickiness of ink jetted by an ink-jet printer.
 3. The improved printing paper as defined in claim 2, wherein the adhesive comprises 43-47 parts by weight of vinyl acetate-acrylic acid ester copolymer resin, 1.5-2.5 parts by weight of a nonionic surfactant (poly ory ethylene nonyl phenyl ether), 16-20 parts by weight of an inorganic filler (calcium carbonate), 1,000-2,000 ppm of vinyl acetate monomer, 1,000-2,000 ppm of 2-ethyl hexyl acrylate monomer, and 32-36 parts by weight of water.
 4. The improved printing paper as defined in claim 2, wherein the coating agent comprises 23-27 parts by weight of silica, 46-50 parts by weight of a polymeric binder, 1 part by weight of an ink sticking agent, 1 part by weight of an ink fixing agent, and 20 parts by weight of water.
 5. A method of manufacturing an improved printing paper, comprising: (A) preparing a coating agent including 23-27 parts by weight of silica, 46-50 parts by weight of a polymeric binder, 1 part by weight of an ink sticking agent, 1 part by weight of an ink fixing agent, and 20 parts by weight of water; (B) applying 8.4 g of the coating agent onto a front surface of a printing paper, followed by a drying process at 120° C. for about 20 sec; (C) preparing an adhesive including 43-47 parts by weight of vinyl acetate-acrylic acid ester copolymer resin, 1.5-2.5 parts by weight of a nonionic surfactant (poly ory ethylene nonyl phenyl ether), 16-20 parts by weight of an inorganic filler (calcium carbonate), 1,000-2,000 ppm of vinyl acetate monomer, 1,000-2,000 ppm of 2-ethyl hexyl acrylate monomer, and 32-36 parts by weight of water; (D) applying 8.4 g of the adhesive onto a back surface of the printing paper; (E) adhering the back surface of the printing paper applied with the adhesive to a polyethylene terephthalate sheet paper; and (F) cutting the printing paper adhered to the sheet paper to a predetermined size. 